- Client side readline functions unconditionally search for Unix '\n' line
endings. In this case, the delimiter statement was set to '//\r' instead 
of the intended '//'. When removing the '\n' check for and remove 
preceeding '\r' character as well.


client/readline.cc:
  Bug#19799 delimiter command not working correctly when sourcing a sql file
  - When removing the '\n' character, check for and remove preceeding '\r' 
  character as well.
mysql-test/r/mysql.result:
  Bug#19799 delimiter command not working correctly when sourcing a sql file
  - Added Results.
mysql-test/t/mysql_delimiter.sql:
  Bug#19799 delimiter command not working correctly when sourcing a sql file
  - Added Tests.
mysql-test/t/mysql_delimiter_19799.sql:
  Bug#19799 delimiter command not working correctly when sourcing a sql file
  - File containing delimiter statement followed by '\r\n' line ending.